To run the 64-bit version of Firefox ESR 52.1.0, your system must meet these minimums:
It is the last major family to support Windows XP and Windows Vista . firefox esr 52.1.0 (64-bit) download
This is one of the final versions to support NPAPI plugins like Java, Silverlight, and Adobe Acrobat . While the standard Firefox 52 release disabled these, the ESR version kept them enabled to aid enterprise transitions. To run the 64-bit version of Firefox ESR 52
Requires GTK+ 3.4, GLib 2.22, and Pango 1.14 or higher. How to Download Firefox ESR 52.1.0 (64-bit) Requires GTK+ 3
It remains compatible with "legacy" XUL-based add-ons that were later disabled in the "Quantum" era (Firefox 57+). System Requirements for 64-bit
Because this is an older release, it is no longer hosted on the main Firefox homepage. You must access it through the official . Release Notes - 52.1.0 Firefox ESR